Do it rock, paper, scissor style. One ascension oath is vulnerable to one while superior to the other.
And please accept the vote of the community. Don't show the homeworld until sufficient intel has been gathered
That is not the vote of the community, do not presume to speak for others. I vote that the homeworld should be one of the first things to become visible. Official exchanges with a different empire will likely take place on the homeworld. Just like in the real world, historically the first thing empires would know about eachother is their capitals. That is also how it works in most Civilization games, for example.